server-skynet-source-3rd-je.../src/zone.c

470 lines
15 KiB
C
Raw Normal View History

#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"
#include "jemalloc/internal/assert.h"
#ifndef JEMALLOC_ZONE
# error "This source file is for zones on Darwin (OS X)."
#endif
/* Definitions of the following structs in malloc/malloc.h might be too old
* for the built binary to run on newer versions of OSX. So use the newest
* possible version of those structs.
*/
typedef struct _malloc_zone_t {
void *reserved1;
void *reserved2;
size_t (*size)(struct _malloc_zone_t *, const void *);
void *(*malloc)(struct _malloc_zone_t *, size_t);
void *(*calloc)(struct _malloc_zone_t *, size_t, size_t);
void *(*valloc)(struct _malloc_zone_t *, size_t);
void (*free)(struct _malloc_zone_t *, void *);
void *(*realloc)(struct _malloc_zone_t *, void *, size_t);
void (*destroy)(struct _malloc_zone_t *);
const char *zone_name;
unsigned (*batch_malloc)(struct _malloc_zone_t *, size_t, void **, unsigned);
void (*batch_free)(struct _malloc_zone_t *, void **, unsigned);
struct malloc_introspection_t *introspect;
unsigned version;
void *(*memalign)(struct _malloc_zone_t *, size_t, size_t);
void (*free_definite_size)(struct _malloc_zone_t *, void *, size_t);
size_t (*pressure_relief)(struct _malloc_zone_t *, size_t);
} malloc_zone_t;
typedef struct {
vm_address_t address;
vm_size_t size;
} vm_range_t;
typedef struct malloc_statistics_t {
unsigned blocks_in_use;
size_t size_in_use;
size_t max_size_in_use;
size_t size_allocated;
} malloc_statistics_t;
typedef kern_return_t memory_reader_t(task_t, vm_address_t, vm_size_t, void **);
typedef void vm_range_recorder_t(task_t, void *, unsigned type, vm_range_t *, unsigned);
typedef struct malloc_introspection_t {
kern_return_t (*enumerator)(task_t, void *, unsigned, vm_address_t, memory_reader_t, vm_range_recorder_t);
size_t (*good_size)(malloc_zone_t *, size_t);
boolean_t (*check)(malloc_zone_t *);
void (*print)(malloc_zone_t *, boolean_t);
void (*log)(malloc_zone_t *, void *);
void (*force_lock)(malloc_zone_t *);
void (*force_unlock)(malloc_zone_t *);
void (*statistics)(malloc_zone_t *, malloc_statistics_t *);
boolean_t (*zone_locked)(malloc_zone_t *);
boolean_t (*enable_discharge_checking)(malloc_zone_t *);
boolean_t (*disable_discharge_checking)(malloc_zone_t *);
void (*discharge)(malloc_zone_t *, void *);
#ifdef __BLOCKS__
void (*enumerate_discharged_pointers)(malloc_zone_t *, void (^)(void *, void *));
#else
void *enumerate_unavailable_without_blocks;
#endif
void (*reinit_lock)(malloc_zone_t *);
} malloc_introspection_t;
extern kern_return_t malloc_get_all_zones(task_t, memory_reader_t, vm_address_t **, unsigned *);
extern malloc_zone_t *malloc_default_zone(void);
extern void malloc_zone_register(malloc_zone_t *zone);
extern void malloc_zone_unregister(malloc_zone_t *zone);
/*
* The malloc_default_purgeable_zone() function is only available on >= 10.6.
* We need to check whether it is present at runtime, thus the weak_import.
*/
extern malloc_zone_t *malloc_default_purgeable_zone(void)
JEMALLOC_ATTR(weak_import);
/******************************************************************************/
/* Data. */
static malloc_zone_t *default_zone, *purgeable_zone;
static malloc_zone_t jemalloc_zone;
static struct malloc_introspection_t jemalloc_zone_introspect;
static pid_t zone_force_lock_pid = -1;
/******************************************************************************/
/* Function prototypes for non-inline static functions. */
static size_t zone_size(malloc_zone_t *zone, const void *ptr);
static void *zone_malloc(malloc_zone_t *zone, size_t size);
static void *zone_calloc(malloc_zone_t *zone, size_t num, size_t size);
static void *zone_valloc(malloc_zone_t *zone, size_t size);
static void zone_free(malloc_zone_t *zone, void *ptr);
static void *zone_realloc(malloc_zone_t *zone, void *ptr, size_t size);
static void *zone_memalign(malloc_zone_t *zone, size_t alignment,
size_t size);
static void zone_free_definite_size(malloc_zone_t *zone, void *ptr,
size_t size);
static void zone_destroy(malloc_zone_t *zone);
static unsigned zone_batch_malloc(struct _malloc_zone_t *zone, size_t size,
void **results, unsigned num_requested);
static void zone_batch_free(struct _malloc_zone_t *zone,
void **to_be_freed, unsigned num_to_be_freed);
static size_t zone_pressure_relief(struct _malloc_zone_t *zone, size_t goal);
static size_t zone_good_size(malloc_zone_t *zone, size_t size);
static kern_return_t zone_enumerator(task_t task, void *data, unsigned type_mask,
vm_address_t zone_address, memory_reader_t reader,
vm_range_recorder_t recorder);
static boolean_t zone_check(malloc_zone_t *zone);
static void zone_print(malloc_zone_t *zone, boolean_t verbose);
static void zone_log(malloc_zone_t *zone, void *address);
static void zone_force_lock(malloc_zone_t *zone);
static void zone_force_unlock(malloc_zone_t *zone);
static void zone_statistics(malloc_zone_t *zone,
malloc_statistics_t *stats);
static boolean_t zone_locked(malloc_zone_t *zone);
static void zone_reinit_lock(malloc_zone_t *zone);
/******************************************************************************/
/*
* Functions.
*/
static size_t
zone_size(malloc_zone_t *zone, const void *ptr) {
/*
* There appear to be places within Darwin (such as setenv(3)) that
* cause calls to this function with pointers that *no* zone owns. If
* we knew that all pointers were owned by *some* zone, we could split
* our zone into two parts, and use one as the default allocator and
* the other as the default deallocator/reallocator. Since that will
* not work in practice, we must check all pointers to assure that they
2016-06-02 04:53:56 +08:00
* reside within a mapped extent before determining size.
*/
return ivsalloc(tsdn_fetch(), ptr);
}
static void *
zone_malloc(malloc_zone_t *zone, size_t size) {
return je_malloc(size);
}
static void *
zone_calloc(malloc_zone_t *zone, size_t num, size_t size) {
return je_calloc(num, size);
}
static void *
zone_valloc(malloc_zone_t *zone, size_t size) {
void *ret = NULL; /* Assignment avoids useless compiler warning. */
je_posix_memalign(&ret, PAGE, size);
return ret;
}
static void
zone_free(malloc_zone_t *zone, void *ptr) {
if (ivsalloc(tsdn_fetch(), ptr) != 0) {
je_free(ptr);
return;
}
free(ptr);
}
static void *
zone_realloc(malloc_zone_t *zone, void *ptr, size_t size) {
if (ivsalloc(tsdn_fetch(), ptr) != 0) {
return je_realloc(ptr, size);
}
return realloc(ptr, size);
}
static void *
zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size) {
void *ret = NULL; /* Assignment avoids useless compiler warning. */
je_posix_memalign(&ret, alignment, size);
return ret;
}
static void
zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size) {
2015-11-12 19:59:29 +08:00
size_t alloc_size;
alloc_size = ivsalloc(tsdn_fetch(), ptr);
2015-11-12 19:59:29 +08:00
if (alloc_size != 0) {
assert(alloc_size == size);
je_free(ptr);
return;
}
free(ptr);
}
static void
zone_destroy(malloc_zone_t *zone) {
/* This function should never be called. */
not_reached();
}
static unsigned
zone_batch_malloc(struct _malloc_zone_t *zone, size_t size, void **results,
unsigned num_requested) {
unsigned i;
for (i = 0; i < num_requested; i++) {
results[i] = je_malloc(size);
if (!results[i])
break;
}
return i;
}
static void
zone_batch_free(struct _malloc_zone_t *zone, void **to_be_freed,
unsigned num_to_be_freed) {
unsigned i;
for (i = 0; i < num_to_be_freed; i++) {
zone_free(zone, to_be_freed[i]);
to_be_freed[i] = NULL;
}
}
static size_t
zone_pressure_relief(struct _malloc_zone_t *zone, size_t goal) {
return 0;
}
static size_t
zone_good_size(malloc_zone_t *zone, size_t size) {
if (size == 0) {
size = 1;
}
return sz_s2u(size);
}
static kern_return_t
zone_enumerator(task_t task, void *data, unsigned type_mask,
vm_address_t zone_address, memory_reader_t reader,
vm_range_recorder_t recorder) {
return KERN_SUCCESS;
}
static boolean_t
zone_check(malloc_zone_t *zone) {
return true;
}
static void
zone_print(malloc_zone_t *zone, boolean_t verbose) {
}
static void
zone_log(malloc_zone_t *zone, void *address) {
}
static void
zone_force_lock(malloc_zone_t *zone) {
if (isthreaded) {
/*
* See the note in zone_force_unlock, below, to see why we need
* this.
*/
assert(zone_force_lock_pid == -1);
zone_force_lock_pid = getpid();
jemalloc_prefork();
}
}
static void
zone_force_unlock(malloc_zone_t *zone) {
/*
* zone_force_lock and zone_force_unlock are the entry points to the
* forking machinery on OS X. The tricky thing is, the child is not
* allowed to unlock mutexes locked in the parent, even if owned by the
* forking thread (and the mutex type we use in OS X will fail an assert
* if we try). In the child, we can get away with reinitializing all
* the mutexes, which has the effect of unlocking them. In the parent,
* doing this would mean we wouldn't wake any waiters blocked on the
* mutexes we unlock. So, we record the pid of the current thread in
* zone_force_lock, and use that to detect if we're in the parent or
* child here, to decide which unlock logic we need.
*/
if (isthreaded) {
assert(zone_force_lock_pid != -1);
if (getpid() == zone_force_lock_pid) {
jemalloc_postfork_parent();
} else {
jemalloc_postfork_child();
}
zone_force_lock_pid = -1;
}
}
static void
zone_statistics(malloc_zone_t *zone, malloc_statistics_t *stats) {
/* We make no effort to actually fill the values */
stats->blocks_in_use = 0;
stats->size_in_use = 0;
stats->max_size_in_use = 0;
stats->size_allocated = 0;
}
static boolean_t
zone_locked(malloc_zone_t *zone) {
/* Pretend no lock is being held */
return false;
}
static void
zone_reinit_lock(malloc_zone_t *zone) {
/* As of OSX 10.12, this function is only used when force_unlock would
* be used if the zone version were < 9. So just use force_unlock. */
zone_force_unlock(zone);
}
static void
zone_init(void) {
jemalloc_zone.size = zone_size;
jemalloc_zone.malloc = zone_malloc;
jemalloc_zone.calloc = zone_calloc;
jemalloc_zone.valloc = zone_valloc;
jemalloc_zone.free = zone_free;
jemalloc_zone.realloc = zone_realloc;
jemalloc_zone.destroy = zone_destroy;
jemalloc_zone.zone_name = "jemalloc_zone";
jemalloc_zone.batch_malloc = zone_batch_malloc;
jemalloc_zone.batch_free = zone_batch_free;
jemalloc_zone.introspect = &jemalloc_zone_introspect;
jemalloc_zone.version = 9;
jemalloc_zone.memalign = zone_memalign;
jemalloc_zone.free_definite_size = zone_free_definite_size;
jemalloc_zone.pressure_relief = zone_pressure_relief;
jemalloc_zone_introspect.enumerator = zone_enumerator;
jemalloc_zone_introspect.good_size = zone_good_size;
jemalloc_zone_introspect.check = zone_check;
jemalloc_zone_introspect.print = zone_print;
jemalloc_zone_introspect.log = zone_log;
jemalloc_zone_introspect.force_lock = zone_force_lock;
jemalloc_zone_introspect.force_unlock = zone_force_unlock;
jemalloc_zone_introspect.statistics = zone_statistics;
jemalloc_zone_introspect.zone_locked = zone_locked;
jemalloc_zone_introspect.enable_discharge_checking = NULL;
jemalloc_zone_introspect.disable_discharge_checking = NULL;
jemalloc_zone_introspect.discharge = NULL;
#ifdef __BLOCKS__
jemalloc_zone_introspect.enumerate_discharged_pointers = NULL;
#else
jemalloc_zone_introspect.enumerate_unavailable_without_blocks = NULL;
#endif
jemalloc_zone_introspect.reinit_lock = zone_reinit_lock;
}
2016-09-27 02:00:32 +08:00
static malloc_zone_t *
zone_default_get(void) {
malloc_zone_t **zones = NULL;
unsigned int num_zones = 0;
/*
* On OSX 10.12, malloc_default_zone returns a special zone that is not
* present in the list of registered zones. That zone uses a "lite zone"
* if one is present (apparently enabled when malloc stack logging is
* enabled), or the first registered zone otherwise. In practice this
* means unless malloc stack logging is enabled, the first registered
2016-09-27 02:00:32 +08:00
* zone is the default. So get the list of zones to get the first one,
* instead of relying on malloc_default_zone.
*/
if (KERN_SUCCESS != malloc_get_all_zones(0, NULL,
2016-09-27 02:00:32 +08:00
(vm_address_t**)&zones, &num_zones)) {
/*
* Reset the value in case the failure happened after it was
* set.
*/
num_zones = 0;
}
if (num_zones) {
return zones[0];
}
return malloc_default_zone();
}
/* As written, this function can only promote jemalloc_zone. */
static void
zone_promote(void) {
malloc_zone_t *zone;
2012-03-27 20:20:12 +08:00
do {
/*
* Unregister and reregister the default zone. On OSX >= 10.6,
* unregistering takes the last registered zone and places it
* at the location of the specified zone. Unregistering the
* default zone thus makes the last registered one the default.
* On OSX < 10.6, unregistering shifts all registered zones.
* The first registered zone then becomes the default.
*/
2012-03-27 20:20:12 +08:00
malloc_zone_unregister(default_zone);
malloc_zone_register(default_zone);
/*
* On OSX 10.6, having the default purgeable zone appear before
* the default zone makes some things crash because it thinks it
2014-09-05 13:27:26 +08:00
* owns the default zone allocated pointers. We thus
* unregister/re-register it in order to ensure it's always
* after the default zone. On OSX < 10.6, there is no purgeable
* zone, so this does nothing. On OSX >= 10.6, unregistering
* replaces the purgeable zone with the last registered zone
2014-12-09 06:40:14 +08:00
* above, i.e. the default zone. Registering it again then puts
2014-09-05 13:27:26 +08:00
* it at the end, obviously after the default zone.
*/
if (purgeable_zone != NULL) {
malloc_zone_unregister(purgeable_zone);
malloc_zone_register(purgeable_zone);
}
zone = zone_default_get();
} while (zone != &jemalloc_zone);
}
JEMALLOC_ATTR(constructor)
void
zone_register(void) {
/*
* If something else replaced the system default zone allocator, don't
* register jemalloc's.
*/
default_zone = zone_default_get();
if (!default_zone->zone_name || strcmp(default_zone->zone_name,
"DefaultMallocZone") != 0) {
return;
}
/*
* The default purgeable zone is created lazily by OSX's libc. It uses
* the default zone when it is created for "small" allocations
* (< 15 KiB), but assumes the default zone is a scalable_zone. This
* obviously fails when the default zone is the jemalloc zone, so
* malloc_default_purgeable_zone() is called beforehand so that the
* default purgeable zone is created when the default zone is still
* a scalable_zone. As purgeable zones only exist on >= 10.6, we need
* to check for the existence of malloc_default_purgeable_zone() at
* run time.
*/
purgeable_zone = (malloc_default_purgeable_zone == NULL) ? NULL :
malloc_default_purgeable_zone();
/* Register the custom zone. At this point it won't be the default. */
zone_init();
malloc_zone_register(&jemalloc_zone);
/* Promote the custom zone to be default. */
zone_promote();
}